Number of nonzero palindromes < 10^n and containing at least one digit '1'.

A050684

Number of nonzero palindromes < 10^n and containing at least one digit '1'.

Terms

    a(0) =1a(1) =2a(2) =20a(3) =38a(4) =290a(5) =542a(6) =3710a(7) =6878a(8) =44390a(9) =81902a(10) =509510a(11) =937118a(12) =5685590a(13) =10434062a(14) =62170310a(15) =113906558a(16) =669532790a(17) =1225159022a(18) =7125795110a(19) =13026431198a(20) =75132155990a(21) =137237880782a(22) =786189403910

External references